Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c6275cfd2e7b61…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 04:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29d3a2f0d573ca53e3d187e75b442b7c SHA-1: 871791797689fca716a747e648136c782fec0932 SHA-256: b5c6275cfd2e7b6119330e0ea1a0dd2c36c85602250e594920cadb6c32e3381a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as 'http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03f3ca5fdb---doditedotabogekap.pdf', are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • 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 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://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/70153588652.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160862e1654321---42240879659.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/98928415988.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1b4e8ce245a04e41d797cbc36edbff7d/vobuwavilije.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d99cea1a0---saxaxud.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5760b1bb05b5d4aae9701cce8e5d9432/55423509258.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/jisusibu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/14135157398.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/fozuresefozutelonuzefebur.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430234748697253.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/xogoxezewosete.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/89541066264.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/fubotajefosurivanotavedaw.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/zolof.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/78516751892.pdfIn PDF document text
    • http://semineebrasov.ro/printuri-fi/files/basowevejegapunop.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fv160hpsne71rmf3f3kd1t4dh3/resaguzawikiz.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/11450397187.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/17198784203.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/55502206797.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608177f4e1792---3576514196.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/15727794344.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03f3ca5fdb---doditedotabogekap.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa//files/givaru.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xizigidakanifodelivewu.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/51951621481.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bh627j42hkqtcnn3dsvhknjse9/mezusepijuzezudutoxofaxub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jokes+in+english+for+kidsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 18092 bytes
SHA-256: a24d0a4c3669075398a6ad73108415f2624f7f849e7362abdc40dd65e1b68f96
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 10456 bytes
SHA-256: d64699a015ba5afba37dab85c40cc74d3e10aa0981a1430ce69cda6caf7a3dce

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