Malicious PDF — malware analysis report

Static analysis result for SHA-256 a396d15138b2c571…

MALICIOUS

PDF

93.8 KB Created: 2021-07-31 00:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae6e08f9c180b48c0f602578799bcf71 SHA-1: 7a0ff235dd75a710c3ed848b4037de7b7435801c SHA-256: a396d15138b2c57145583731a06329f72eaf0873af8af425058452a76e0e93a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://tribo.kz/userfiles/File/kexokibekazusix.pdf In PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pewigavizenojalemazu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7b0db4gm75c49s7oh2mfh7tsa7/70896198633.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/wusivaxexufi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/2995801262.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/90499299985.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/tr5p4qa99j7sgcddq4r0akbbeh/12479595554.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4012412919---dewinaganadubifavigosa.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mo0m6ss9890va6qk5jc5eeagco/davevujar.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d891bd87b---bagapoxifonof.pdfIn PDF document text
    • http://berbun.com/user_img/file/51193346323.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/91ef3e2f65174693e43810e61eae15b6/80105389718.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/bivadenapamojixit.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zilorowilozagipatemurago.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/49409042547.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/79776322736.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96n16qk93aosb5vlomc0b1c243/1736872058.pdfIn PDF document text
    • http://aimic.com/userfiles/file/petajule.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9f47kg1hd1ghdohf7cq3rql38h/38834288971.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb212a52d4---63025843920.pdfIn PDF document text
    • https://latework.cz/soubory/rimugefob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ka+kha+ga+nepali+rhymesPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/87694478336.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0000fe9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE9A 17932 bytes
SHA-256: 73af1f936f462db059c5a672174333c8f37fa0c4d7644de8dd0c36d2c84fe4bc
font_00_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 2212 bytes
SHA-256: 6d3065cd139a12782670d651f0070f3a9d52f16c374785e41351fddd1facc260
font_03_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 20604 bytes
SHA-256: 9ca1a70433b815c7e0945b24d017be4706385dc591d3e2f2240d134fa319f2f0
font_04_sfnt_off00014db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB5 10680 bytes
SHA-256: 30ee19458c882fe293fe182624c0ee113143e0684fb06b064cdfa3e97376955e

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