Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f20ebbbd26ed221…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 21:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1afd965b2346dcc598529ae90578bdac SHA-1: a96ad25b4a348c0106fe4bd4a648071dc70f3bb8 SHA-256: 4f20ebbbd26ed221b8bdbd18071ac7d99a76f8aa9bee88cf7ba0e02a2f740007
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute further payloads or phish users. The presence of these links and the PDF structure strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd992bc0b7---17899678507.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29cb12a0a---13302315813.pdf
    • http://alituncer.com/userfiles/file/lejadaguribe.pdf
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/96859406811.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160868e2898a29---dutoxafaka.pdf
    • https://baohohoanglong.com/userfiles/file/4543368117.pdf
    • http://zulassung4you.de/bilder/file/xuzel.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/womopoxadu.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844aeaa1fa5---xanonowarifikuxod.pdf
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/90621244294.pdf
    • https://ndmoyun.com/calisma2/files/uploads/16799345179.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47bf99403---zixijuko.pdf
    • http://dermalab.pl/userfiles/file/kigune.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c4570bc8---60386805654.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8757721b7ca56ae51a15eb1a6fa2156f/xulajog.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/728fb572d1aa2e61dc7c1a4f5531c400/24346117618.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6accdcd31c7c40d48e58deda44ab76cd/wiwaz.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7cdf9f58a7c74952dfe35a0700bb56c3/xoseditudalufawosafoder.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c460ebb158d---22970664954.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d92dd5ed0---17666227994.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7139bed76bb41f4b998fdae70369fa62/27647200194.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8t2eho4nn2hsbthl44jf1ohtbt/madobafunenaj.pdf
    • http://sl-light.ru/design/img/upload/file/giwuganonam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nature+of+mncs
    • 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_off000109c4.bin
aaa691b4080e25073d54167629151b24bb06f75be36e55f48608f0735c9f2704
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 18080 bytes
font_01_sfnt_off00013884.bin
858a36000d25f26d37702db5ff999685f6498bc0e7760a4d3329ca8596ab55c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 10436 bytes
font_02_sfnt_off00015040.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15040 16792 bytes