Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a43d72a54e87e20…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 03:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28ed1e2ec02c6a55b40051b637a83417 SHA-1: f1c1547ef6c7cf596498934999c3f804ff81ecc8 SHA-256: 4a43d72a54e87e20ba064a42fe92b5d5dfa2ce5275d7a176cd72f1e4e09f59a5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607006a65651f---gilofevorupomepofade.pdf In PDF document text
    • http://zoldjogsi.hu/uploads/files/48558494799.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/01bdcdf001e4d68feb16e09a5c2d2b58/vutemifapeguwawozedutoj.pdfIn PDF document text
    • http://basisangka.com/contents/files/waxako.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zagatop.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/r8u8k6jdnt0f45aj53emgc7kic/26978519692.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/xeporidowun.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l524kofp1qc7m1fvmess5bpkub/44555224829.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/151a90ef5997841da07717557f680475/kokel.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/82751f20af40ff7db2f8002e12e76647/ridiwisoxolizukefe.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/koxogiluf.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc48d33a03---dixupenotojumel.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8265eca2820cedbbb07dab32d549ea2e/kajovomiw.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8777d27bdbbc0b35cfeb0be6c3564695/xufolikarujobepefisij.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/lefowelilelarakuvadevota.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785a7367523---nijibewamigab.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/58406667925.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/begarenogawufagijev.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ttgqv7saoe296jp6367m786klm/9518652777.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/13ja8q5pdp4n1t1dhodlfhhrv3/labepib.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/18431e84a94b39a92f506ac04f065c53/kufemelogujubep.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b56d1f489---22587992710.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/zifogotasuposukaru.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/36383155300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=slavery+in+ancient+egypt+pdfPDF 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_off0000c55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 10760 bytes
SHA-256: 4a9eeb4fcd0f21e553fde7b0f59bdb8c27146b6c5365f83ad345b1d224aa6314
font_01_sfnt_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16492 bytes
SHA-256: 41fc2f12416652b024d45881fc9d20ab88b611b076488f3ee64fae6f1686cfb7

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