Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b51432dbd54b14…

MALICIOUS

PDF

129.7 KB Created: 2021-08-11 09:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1c703e94a660d2a71ad8c0688ccbbdfa SHA-1: 4103d8c04929ad3fca742343d7b48c3f7514ad72 SHA-256: 70b51432dbd54b144167beb4b295bd9769e51550cc23ff73c44ad1474424306d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://albino-pitti.com/pub_img/file/sibogexupukunil.pdf In PDF document text
    • http://brenna-ski.pl/userfiles/file/67370922782.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/bexamatuwefarilo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/5368507392.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dd79f39699432889bdb1da7d5d89be2a/tefemutilaza.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcca53362f---42383499264.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/47618472936.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/rafezakesitopuwiwa.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/17473757116.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lu4oibekm40co7vhb14rpmp9qd/kojuwamokemolelepob.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ed8ab26890f9d2b60c41a4c759b1f2ed/putusoj.pdfIn PDF document text
    • https://room12shio4.com/contents//files/60218798017.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/82bcb0e4fb78d70e066f4e52643e8fce/divelosozegipu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d7d33cfb732a41827028aba37f323d50/xixoxuwolan.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/043c32056fca09c2d7b42cec91cf15fe/babokagojewebibedakagig.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a3526eef---bezofuxujowozutuko.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a60e737e7---82141600057.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ecbfe14r8m7p8b4hff82ionok6/57812216526.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1c9d718e---69241637364.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c46861f0---pemufemebidelikavumunoset.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/overclohrl1ma7kqfhc2egjk0j/befogemotobiroxex.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/22u8j9oasqcqrb38ha4hsuuum4/lafazepilonorubis.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/wanitugipoxazabirojoworef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+texture+packs+for+minecraft+pe+iosPDF 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_off00019614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ae26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE26 18472 bytes
SHA-256: c5c73fd0df683d70c428f2f2a8f060ef8ce2d517557afe35d59d6faa1b7999c6
font_02_sfnt_off0001ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDFC 11148 bytes
SHA-256: 30e84f74db8adcb710ea635b65f76f97198e159a33e9ab2f887dd31692f01eac

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