Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cbfe195ae558d4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 03:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3973cd1951a017a1d2f7db4ef4ed733 SHA-1: 03b8f12277c0525933ae97c2a1d9e9047bbcdc39 SHA-256: d8cbfe195ae558d461ef8608d293fc8cb7d7cba3e2438aaa5371b2f0a680d31d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, many of which appear to be compromised. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into interacting with the document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cpsguffanti.com/uploads/file/64459093693.pdf In PDF document text
    • http://a9188.com/upload_files/art_files/files/20210911_233153.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/wofuz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4d05fcc7---tasugunoposafugotum.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://bfttacg.marketsearching.com/upload/files/wadipudaxinebogawopuvadiv.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/66440947175.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7a647c9943e30de942d43af66486057e/82531758840.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/36236223924.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c11c7c6d3---xapepenogaziranifezojo.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/56487156732.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/91399717532.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/judofinalopuzozekidabipo.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/jusiwesilipifuror.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/gukisotaje.pdfIn PDF document text
    • http://sinoorchids.com/image/file/zirojajidebedak.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/rabatumivuwesatukofaxisa.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/nolefikerabovokibezalog.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/15065670492.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0256d49e7---ritagibotagamesopadovume.pdfIn PDF document text
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/37804909370.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b647da3687---60080854731.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/wobawewuponosesokesi.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jomedo.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/merikiwax.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pidunutusifobijipo.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/dapugebibududetatuneza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+unlock+htc+android+phonesPDF 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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 18424 bytes
SHA-256: 0921efd6f332474247d041994f798793164d9e60ae3e579d80065c2eeef68414
font_01_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 10880 bytes
SHA-256: 63352c38f9b56c5653306557a9e83e54d2b5f7c7d7825587a385a64c8cd705a3

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