Malicious PDF — malware analysis report

Static analysis result for SHA-256 220efe789aa1b5fb…

MALICIOUS

PDF

85.6 KB Created: 2021-07-28 07:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d46d6204fd96681793360891f1ca5192 SHA-1: f9dcb5fcb8531b6a58c1da6e64b93683151e1b6f SHA-256: 220efe789aa1b5fbbc2ecb7e55ec485973d64c8b801494574edc842d6cd63614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL destinations strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/6b8f6146703b9c1a167581659777f3c9/xevemamevaxarug.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f947c3c9682a294b05ff5ad6806714d8/12038576644.pdf
    • http://dynamic1984.com/user_file/file/sawizorasejatekilitere.pdf
    • http://emekyesiltepe.net/images_upload/files/21096271708.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1bbba9b9---tolelewanidazolurewetub.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b19c2d458---96375305870.pdf
    • http://fandimnarodaku.cz/upload/file/22054811560.pdf
    • https://autoparkalbanese.it/file/bewafavumipeveremuve.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8005f70e3d---53233880415.pdf
    • http://kotolantopeni.cz/file/53153523396.pdf
    • http://hasici-pristroje-eshop.cz/files/file/55836190077.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b8767b0ef---bufefesudi.pdf
    • http://daydreamspin.com/userfiles/file/wanetukaki.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/17e2498a5af590b264b4b7b1247844b4/81325430675.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fab56a341352e42fdc88fccf19215ed3/ramibarezetizerelekefuwet.pdf
    • http://shimamura-mail-order.com/userfiles/file/32330654557.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a02a164a---63207925114.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9386153d4---47771632706.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20572644a---4209971759.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/idi5o1qgaccgrnkq4srrhgput2/romigujavabupuda.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/4337352364.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf88a645a---sofavixigew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=irregular+verbs+sentences+exercises+pdf
    • 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_off0000e9bb.bin
79c3b7936aeacec80d99933d6c880ef06567c2311124ab048f4421a7afef6e21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 17160 bytes
font_01_sfnt_off00011671.bin
81507c99fdf66d0b24f8144211bd9fc0fb5aa059206f6c83abdc76e90e503a10
pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 11036 bytes
font_02_sfnt_off00012fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 16792 bytes