Malicious PDF — malware analysis report

Static analysis result for SHA-256 7118626ef4659f17…

MALICIOUS

PDF

88.3 KB Created: 2021-08-03 08:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 114b004926ce5de934904d95169fe188 SHA-1: 43724f9ebbb0c6a259b7d54cea26dfae47663b42 SHA-256: 7118626ef4659f17f399d2ff842e68a7e5b867e32b71f74543cfe113036200c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a likely attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file. The presence of multiple PDF_URI and PDF_RANDOM_URL_LINK heuristics further reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d57f3973---giketevatubazomafapedoxub.pdf In PDF document text
    • http://mestav.sk/uploaded_images/file/ruzelopiremidisar.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607561adeb453---tevitujejudotimapaxawev.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075955616b23---12161540501.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/nivawelupe.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075495a2eb8c---69066051769.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/goxewijaxasezariluxapuxe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d7caf5d739d---83064816638.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rp5qorgjji5c5vr3655inkl9l6/24685614807.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8b27b261eb9fe8591c280abf42804176/53488857150.pdfIn PDF document text
    • http://unsersohn.ch/images/file/9492074631.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/1094228581.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e209bd4328---xidigoxelepugo.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/pexaxogaximugef.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/fdf05552a315b769c2affde7860787dd/fululo.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/raxofeputokizowanasasof.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/86638053256.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/19109617732.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/ruwop.pdfIn PDF document text
    • http://talleresjpg.es/img/file/dizujubunodixodevilumu.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/kinugefukiwirafi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m7mcr4dqj0tejlp7o6994stjr3/patizojuditetotunurif.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb535cb28e---38314946636.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gakukogebavaputisadi.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/netejemivugutulopogofodip.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kuvugirokonivaxufegafigu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e02ae3e5b9ff7c3e77d706c3ac6ac6b9/79258734075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+a+training+program+on+excelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 17308 bytes
SHA-256: b68a1f55265bf3addfadc8760046180c7fcd6989f8e8cfce7ce8487457ec82a0
font_01_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 10820 bytes
SHA-256: ec01ca772b8b680dc948ce80380679ec4ead4067de7ca72de577357dc4e96180

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