Malicious PDF — malware analysis report

Static analysis result for SHA-256 39acf346355be0a4…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 02:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abc81b7f82d048009cd5dfdde64842fb SHA-1: 7f674c1801002f5d224758c48ca1262880247b15 SHA-256: 39acf346355be0a48225b7c9f62e36a67327353fb3d92a9eb6f8a92e4b15a923
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of numerous links on disposable hosting and the use of UTM parameters further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://naturallabs.de/userfiles/file/vuzekijivupijod.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086941f01e76---84360649185.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/96acdd4c65da354d9c4cdaa23ad774b1/gamokefegogomopijewevi.pdf
    • http://aytekinpolatel.com/image/files/63806339670.pdf
    • http://bpabv.nl/uploadfiles/file/sibolurezikuzisunamowader.pdf
    • https://airshow-bg.com/file/5127308576.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082c409ba7---xobivaloditataw.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xebudarivaxupu.pdf
    • http://russkiivopros.com/images/FCKeditor/file/rokulakupagofikav.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6dc9baf0f80c088e8d58deb9154361e2/24223774041.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/36e773f0627f9c4bf81d5201e1f6024c/57237752465.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077afc3f3c12---bizimebawonake.pdf
    • https://bleikss.com/userfiles/file/85170286424.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb5822cd5---57408987406.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa55595931c---87869117667.pdf
    • http://files.ibiza-ferien.de/file/78281628033.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0068285c---20395148938.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e44bd618---88523555569.pdf
    • http://teknis.it/userfiles/files/45917211544.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51f58f5307dba9bcd1aac30ba9b5c479/nezobirikifuwatomo.pdf
    • https://cmsschoolkg.org/userfiles/file/45552479503.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9a77c52d08f8ab0672d8cfd691feee69/kudazabesomegaxosej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sexiest+video+clips
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc92.bin
88c1c920c2c5c9e135d10a5eef043f99c5a3a1ccaa51e56f812e0fe4790c30ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 17896 bytes
font_01_sfnt_off00012b19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 16792 bytes
font_02_sfnt_off00014330.bin
6aa83de1f1cffb00ab227c43954f40af715b8a15a94ebcc875f23a735a2055c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 10384 bytes