Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dcc5b2a2b58c44…

MALICIOUS

PDF

105.3 KB Created: 2021-07-13 20:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 841e1c2ac1c55c25d36835b741954337 SHA-1: 9cac95ffff20f572dd22a12d27e397a98b22b4bc SHA-256: 54dcc5b2a2b58c449aea5e7611a407dfe12f62e3826961d17fc917558cb4bb31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9308

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amexeuro.com/an3_Uploads/file/jojajaferi.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dalipuko.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/38gkmnaqin8n4kv1sv09i07dg2/39923793771.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160767e032156c---ruwuzewefenivabazixegafe.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/52047902671.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/75590777695.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/99086052487.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3946d2965---litadurawefubadinob.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sizudometetinanexenekifof.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/joborokubizebapijevuzi.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/88321625830.pdfIn PDF document text
    • http://sns.hu/_user/file/gebamukopatamidare.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b44218314e35efd14cab7b608451c4fb/muxevejifid.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfb592644---86793786392.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/teliwuxefozufoxozilovub.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/37241204449.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jakamokigojufedizal.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/19328174114.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jdl009fuosc95ofi4kmqmniko1/xevosonebilase.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b743a9e0a2f9e237520555a9d3f830f3/dolosigifewaserif.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092157028fce---duxufinoludajex.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050208122873499.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mutanuxenitujuso.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5bibdggbk57qenu9um6td41r4/bureladumadot.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3mt6so3f0ukngr7cd2pam4su17/63559573148.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ce5d92bb7a36ab750bd1fedb08691f8b/bisapesezisozukazof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+meaning+of+departurePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f531.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF531 19004 bytes
SHA-256: 8ef4e6290091d788c9ee1fee1fb4c6fec25ce71c60ab7b4410921e9a0cbd19c4
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 4596 bytes
SHA-256: 1beecbbe4e5c6e879a2c5aec543abf222c7b808a5a19265093cdb2515f94bf05
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10792 bytes
SHA-256: 3830afe0b4b5468e8f302d7f2c561f21776a329d02633518eda3e3c65f3673d1
font_03_sfnt_off00013ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDB 26468 bytes
SHA-256: c071a5cc2252ea14f1e23daeb3549423139164b4d0861cdb130dbfe747af2dd7
font_04_sfnt_off00017d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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