Malicious PDF — malware analysis report

Static analysis result for SHA-256 37075accf2270202…

MALICIOUS

PDF

102.3 KB Created: 2021-08-07 08:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f52ca9087fd168a3fcbfd04d248b9e50 SHA-1: 015690d6a053a715bae5e70ece205499e072c9a0 SHA-256: 37075accf22702028714c4c3621542bd66a17936518495b8bd5be50a8fc9dad7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The primary purpose appears to be to redirect users to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ulv-fogger.es/d/files/gitorifazigefakevomedu.pdf In PDF document text
    • https://lienlacanien.com/img_pages/file/jagevazumofawufesupafojib.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c843dea8aae37ae5a49949f0115685d6/pibimagop.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a926d69fac7---bogiraxuxupazezenumuve.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6f77c10cce93ceac2d526238d43feaf7/soguj.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3d6be70a9bf47fe3771ad3f20e5bdb80/22667165239.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/1875824257.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/da0d9efdf80ca278a8d3240691751b78/tifesobodelowadix.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd155e1dd---jelaw.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba05cde0606---losufekazujegan.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e4f7ldda1n3d9ktn1rthd3fjt2/90059695512.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/gexalenuwo.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/52669102941.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/muxubo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1e8ee2f3---zunemasil.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46eb421dbe5f04de5cd7de3827622964/guvap.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g3cjsagq4t46pk9kq1g3rgkmeb/72745715588.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/763f8c84d1dbe5d97e7c5489d75c2359/bopun.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/79a128a77f7bbc06226cacf2ce7d5e2b/nepobunivabizulerewavu.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/xalavesuzivoridom.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/jawoze.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ddd83704---zivugefagunubitejapu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/dovinejarijosukikevebumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7f98b997---kiketilojimokod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+upper+and+lower+bound+in+mathPDF 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_006_off0000ffa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFA6 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 24008 bytes
SHA-256: 9f951756f8e2569a85763e8466f4cf4c98cd9c8204a7fb804ae5fce3f03c2614
font_03_sfnt_off00015877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001708e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708E 10976 bytes
SHA-256: 50eba3320c407e4eaeecaa4181317387ceb301d573a801ce4af7f3c564512529

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