Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b370089382abd6…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 18:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41d32cb7bc4b493c2213838c21f81b1b SHA-1: b3fd276698995c986f030fb3e86cbeb7e93e9b50 SHA-256: 31b370089382abd6407b0b44b9e3db82822ef8571b0b028d14c5c4cce008b89d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to distribute phishing content or malware. The presence of embedded URLs and the PDF's structure suggest it acts as a lure to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://pistant.ru/uplcv?utm_term=necrotizing+fasciitis+adalah+pdf PDF link annotation
    • http://srsheicha.com/uploadfile/file/dunox.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31caa900f---logimuwiror.pdfIn PDF document text
    • http://email-database.info/userfiles/file/guxasedowujetulitijitavil.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tofr0tqo4tmm8fne1auibmqhl3/55802604314.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8fc115848b40f9061c9d01c14dc7371c/65133949861.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/183358763760a03615ea530.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/dubijaziwi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b91b15abd7---26742523713.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mlrrldsck6vkplct73cpi4ri13/32086659324.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc08b43962---gitekagoxuvulura.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/58091161383.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc94d74969d---rokeboj.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2ec33b5405919f916b26782bdb53304d/latepobijajokek.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/biparevusese.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f23801626f9---pafofa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3f34e21dea05a3193ad4feea11814b1d/zozegegobelifaboleri.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c1eec53c---jojodoxajukulolafawulo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97226344f---delorogenujikipuv.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/j6aubul7j7heo6ve39vqc44hb2/32687821745.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/81694824490.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/kovukepoboranukij.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nesagajogejo.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/vozasuwerujubumaku.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/winomanofepedofegumew.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8e68ea20e5e03bfd876e1b7101f9857e/tijorumadenubuzakumabono.pdfIn PDF document text
    • 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_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 17484 bytes
SHA-256: 88403831dcb845825355aa41afc3e2dc72e15a6234cbc2237718488fdc003f8b
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10936 bytes
SHA-256: c2397ba8021edf39af63fe401989a279fc3ad501a12c7e1b656aae502ca8a6ae
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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