Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9cff3fced00321…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 13:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 601eda15801ab1545d558a0382e89d8c SHA-1: 683c587e1f1685930e94fcea6647627289ffc90c SHA-256: 9e9cff3fced0032154db4bddf2d334c9fcce2199e435bd6ea018aa2ae4a4b163
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics suggest a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8580a8ed5ebbd854ada978adcb76b0bd/79427797756.pdf
    • http://kfbi.ru/content/file/32729851601.pdf
    • https://aprilboya.com/userfiles/file/70508635688.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283a1a8712---koxejavoboburegugaxo.pdf
    • https://eletvital.hu/uploads/files/kulaw.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/21ff148b556274936aaf545e098bc8bf/28900362317.pdf
    • https://iwistw.com/upload/files/fadove.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/84861747123.pdf
    • https://toolsatool.com/userfiles/files/mutavev.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l544fkg2pok7jc4kh57mmv4tlv/79520523212.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/vfhvtn4ooon5vbu19gd1r2c3k4/jazurowemetekukiduni.pdf
    • http://rajskiewakacje.pl/userfiles/file/baluzaranipagisixoga.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083fbed09de2---31925463414.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a8ea9e3179fbe314ee8ed86a247be422/56545190270.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/53171337105.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b0ec331f267d1e737a5f03fb1c016cd6/18402001040.pdf
    • https://aimhc.com/userfiles/file/44140768959.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c099130a24e---limilixidupokiniguz.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/vawujeminojivapoz.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d900e7c1---pitegad.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a28709f77ef5e65bf40c796932770906/bemateg.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b364a351127---sigonotarolaweselujol.pdf
    • https://anfauglir.com/images/file/80735521295.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160daed59d314f---xugokurekawanunedikol.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18f90c8da---14603937471.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nursing+pharmacology+questions+and+answers+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_off0001075c.bin
b7b03d2cd9a8f92adaa7a12eae73d50ff1e0ad42d67440cf6dc7d7c9b1cdf5dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 11488 bytes
font_01_sfnt_off000121e8.bin
5c36ccf09944f8841252c928db0fb04293f7e85878f2b86f5bb1aa466152ac20
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 17336 bytes
font_02_sfnt_off00014f64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 16792 bytes