Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8b8557ea51c0a8…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 09:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80c3bba2b8eec76a29076e518c25e3a8 SHA-1: d2fa05941e66a3720fc80f9549e111fd650a6cb8 SHA-256: be8b8557ea51c0a848cfd251b8f874fad96eaf35698862cd34c3b1ad1f1adfff
164 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. It contains numerous links pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of urgency lures further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889027ab80---diratutefagizeb.pdf In PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/siledinojukapikikodaped.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ckujb769bmeqdk30p3b20olpo3/wisil.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/lf57ov29fqh3fs3m0oh7uckucr/5451225687.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mejakofasiru.pdfIn PDF document text
    • https://magerp.org/upload/files/petebuloxaro.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-9/20210509232236796564.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/20786995303.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3a709d97---toluwidelevozanixad.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5a6e695e4c68589f116e8f51c6044f6f/dudiwibokapudupe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7084e6d89b---giwiruliwaxuwid.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb02452480---kosinoxadupajagobomexibof.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608191524196c---75498154229.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad6c701ea---lonebusavup.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/kugumezewajawiwabaj.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g4jopntoqjpohe6tq817l2rn07/ripakunefasosibuwedugovex.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nivb93fofie3dvm1qra0gh6hk1/rupode.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7d58e8b888f4ed7d5e4f2dee143eea59/66992335965.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/miropil.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/58483364204f023f5d1db7009f16a4df/75520493737.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jukidigilagukebakowedat.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/tobunopuxitowujosazix.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/konumiguxemixonolusosulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+answer+the+questionPDF 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_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 17288 bytes
SHA-256: 7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52
font_02_sfnt_off00014072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 10736 bytes
SHA-256: e55a48a482aea34cafdcd561d637b59f72b6bdbc6c2b17b9833548bdb3c24173