Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb14fe4d402a8ac…

MALICIOUS

PDF

93.6 KB Created: 2021-09-04 14:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 527920ba5f6083f110dac14dc9bf3316 SHA-1: bba4eca93b0832233cbc59e8f6aca1bef0e40616 SHA-256: cbb14fe4d402a8aca6abe46fa6aa3161620a3071d6d679660b3f53d0bc457966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://accesoriosalmayor.com/images/userfiles/file/zosatemalogubano.pdf In PDF document text
    • http://bluelakehomestay.com/uploads/image/files/24196954204.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05f3928f88---72027419605.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/5180850097.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a6c1aa91---13031686026.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/dotemupo.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021082007075413.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/gibodomumana.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tevufazemilurudiguxul.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c176f972---figigenubavamamejolekut.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac713bec1---detizid.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sofisajivimeb.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/44405786750.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/59582701617.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/wimibatufaliriwalafo.pdfIn PDF document text
    • http://petrduchek.com/files/81180907385.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c8c28acf0a8178925ecce403cd99f9a4/kapijazamububag.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210729_D518B76F366024C7.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/lofimigenobebetezaxudixu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c783ecbe3e---tubebubirutawitiremoku.pdfIn PDF document text
    • https://ckmandarin.com/uploads/dalexowivezu.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/sakofowujoremuvav.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/3146067137.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kazoganobudaposawisu.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/6787091129.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad70971e3f---98337780128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=matching+worksheet+for+3+year+oldsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 19464 bytes
SHA-256: 5031b41bc1331e81089a2e806c7af7c0aa4a4810099df78d7acc86ca72ba673f
font_01_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3D 11212 bytes
SHA-256: af97f724879434500adb87f831e6763e63e6b9a1173b10c7a255e06ebb4780e9