Malicious PDF — malware analysis report

Static analysis result for SHA-256 37733a0bc1d71584…

MALICIOUS

PDF

175.8 KB Created: 2021-06-04 07:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 71be68eed8650b32a4ba266a40e31791 SHA-1: 320605e8f7e218761f9021ffedc1d8fa44f3b960 SHA-256: 37733a0bc1d71584e50631aaccdaad138b61fc64cd7ac9fd68a9a6abfebc0677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786209c6066---11975380991.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b50a9fcf---51502314138.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57015758831.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c11dae1471169e664983ce3abb42144f/dirimafawamitujub.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5dbd1b929c10315dc260acab9285eb80/sanigetekux.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3ruqloqbvkvb7ht2p257ucigcm/65408550802.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa26a7606---12291290509.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad14d5309---75293724101.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a326037c191---lomivag.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3442303571.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/06fb40f8992bdcc0b89270129c011d81/berosokadeluze.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5d69ac0e66109543ff925cbad1738879/2704648628.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xigepoxuxebiwebemudis.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kreg81dh5bl3h2ll7iqhppnua5/tapawikelifetimo.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/95d75553712558e678d7ad67f450e1a2/63395343809.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1462b3e27---xajolovenuxafebufebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=filmywap+bollywood+movies+2018PDF 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000282bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x282BD 17340 bytes
SHA-256: e000aafcf2c1303d0c5ad992017c118909798262f89c7158f715e4600b3210a3
font_00_sfnt_off000220fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220FA 6188 bytes
SHA-256: f194db6cdc50af768ad85ba1842945d513d0478a1c679e2d43f8e2087e44573a
font_01_sfnt_off0002364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2364E 5880 bytes
SHA-256: a1a17d2641342ea9ddd20dc5ec85a856879b39f886e9ec29f18159cade90856c
font_02_sfnt_off00024a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A4E 5672 bytes
SHA-256: dbfa5413c1a9c227ff4952054b5b0b4ac96982f99bb483e8315c477d4481d2cf
font_03_sfnt_off0002585d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2585D 12716 bytes
SHA-256: 8ebd31b1929e37c41bdccac2f092f0d086af8efc54467fc68dbbec83fec47842
font_05_sfnt_off00029c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C6E 5960 bytes
SHA-256: 0a9aa95e33d05dd5a0bb4c4e52eeedf03d7da9acedd825c66ab4bf650b7ee8f7

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