Malicious PDF — malware analysis report

Static analysis result for SHA-256 791d23290cd33f22…

MALICIOUS

PDF

88.4 KB Created: 2021-07-31 18:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2618fcdd19653aad43a03b32bb8f76ee SHA-1: 3d938b6891c490f1cfc7adc308b6171674928543 SHA-256: 791d23290cd33f224bfed8a39a338d789dc51c3f4fda550a54ef8f97c65329d7
156 Risk Score

Malware Insights

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

The PDF contains a link farm that points to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users through a series of links, likely to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9d3ebf0b---76740763262.pdf
    • http://kstarsmall.net/userfiles/file///lokaladojonubeg.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607522dfa064e---xoxegelimefidetumuladepuz.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e239a9f67---jivuruzilazudijira.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083ab9ed871b---darinava.pdf
    • http://qtjdb.com/UploadFile/2021/07/16/file/20210716_155238_178.pdf
    • http://pomocnaukowa.net/Upload/file/towipewivebuvepeze.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rkki1uluqihivvh9tbedgoq4c1/xibixoduxasefok.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3b6fa02fd9883278a55ddb068ae77562/jijadun.pdf
    • https://sonarmusic.hu/up_image/file/53566417261.pdf
    • http://accronline.com/userfiles/file/gawebato.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/16384635801.pdf
    • http://schokofontaenen.de/idata/setekifojevo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bd820a7f3c2---fedebarineja.pdf
    • http://scvumaichiramen.com/uploads/files/juxafubosegofo.pdf
    • http://haai.org/upload/file/faxadarevepilunegizizig.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee80b445a1---buzibutapiketo.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d9ce7d80---56096212627.pdf
    • https://akita-inu.lv/www/files/files/81067752609.pdf
    • http://allamericannursing.com/userfiles/file/lujazevaru.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/25483da53e2bc9be1a6725f6689ba6f1/gikat.pdf
    • https://dovolena-jiznicechy.cz/uploads/senegigasamevemefim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+facebook+app+installer+android
    • 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_off0000f626.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16792 bytes
font_01_sfnt_off00010e38.bin
f7362ecac27328430046cab8401478aa91366d8cdda2c9c2b5ba7feb380666bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 16788 bytes
font_02_sfnt_off00013992.bin
26f5e58aa10097dcc79b08260b676c56e7c4f8f9d15014c1ff5e085a8591ae78
pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 10940 bytes