Malicious PDF — malware analysis report

Static analysis result for SHA-256 78509afff457af17…

MALICIOUS

PDF

101.8 KB Created: 2021-07-04 03:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a6be919ae509a2c2ed4170c61bb31e2b SHA-1: bce65fa05c75e3901325668f2956585cd04af4ab SHA-256: 78509afff457af17f5d77167de95eda76a0b9cdc50b6fe58af95eaffa23bb5ba
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of a download button lure further supports a deceptive workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=wpa+wps+tester+for+pc PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/384022d2090fde66068b9b51862c64dc/79462874374.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e93ec8fbb8---49042055588.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a40d30f08222643f31e232ba594de4d5/19879832080.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10e36eaeaf19744c8010fb7391005d00/35998268238.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/de7331bbc6a62547dcbef6d8c88e7de2/taxemetuworetidaboxu.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/77016278821.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/zitufe.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/8685686322.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a469c17f1dd25576e5b395286a192470/wukizu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ebe10f84---tetujudoso.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/fuvuruzaredarigafeniluziv.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/vuwosesutog.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/68580215290.pdfIn PDF document text
    • https://luminex.pl/upload/file/51253348288.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4eaddbd7acd2041612cc0fd5a5d26fd8/milijadizevuwemeleduxozi.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/20816548821.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3b51176c5bed4b6181b739d421fdd445/64780994390.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mjn7dojc2nioiivkthd2kualek/toxaja.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/mopiw.pdfIn PDF document text
    • http://fkhd.cz/data/img/86375657602.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e5949f4f---bixibitonov.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d31fdf6ca15352ec815c9f868e120e96/dejabiviwon.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kudubowumuz.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/110538167671.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949e7939d4c---wuletefo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eg1s3c05c58t7ngvd7iu09b51i/41952030644.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010e93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E93 30080 bytes
SHA-256: 5f4fbe20163975425705f31f98d2e709e2ed1355939cb84b7abbfe5e18a86b79
font_00_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 17376 bytes
SHA-256: ce307404cbc1fd7302e7b6494f24212b1ecfeffd5cdb227c149b66c9dc7740f6
font_03_sfnt_off000171f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F8 10308 bytes
SHA-256: d6e7ce3b2229e89d8455d14d57becfcca2de016d4793f31c53f7092b4345b9a0

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