Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aa2a015e7fd1ec…

MALICIOUS

PDF

97.5 KB Created: 2021-07-14 08:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7625fd0e9f501c2838ced9fd1eb02e6c SHA-1: 7eaaf97bb8a961e180f86ad79d9c62d6701ec902 SHA-256: 37aa2a015e7fd1ec6b288347a3de15eb972e4dbeda643fda11396732b6aab778
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 ML classifiers and ClamAV, specifically flagged as phishing and a trojan. It contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites using form builder plugins, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd02a52071---7874194972.pdf
    • http://amadpich.com/userfiles/file/biwekipaxevavigoxi.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/bexuvek.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ue0gqu6qm2eh07g0graqriu7t6/sojaralur.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0b6e9025---56202129036.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a133dc96d---60749696737.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8ki45rcrg6lm6op6h0j5ris9n3/novugupasa.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/dpf2gvk1c3r9rfug6hto6ekh9u/jovoxaxoguxuxofexa.pdf
    • http://www.look4job.gr/images/_user_na/file/24292045179.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6sekhvrc02qo4vbpl6ocnshfbj/69974470324.pdf
    • http://malbreil.com/userfiles/file/76034928282.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9b0bdbb858e42bacb2cbd2e17be7ee26/gebaxizaparatajumojejupa.pdf
    • http://dgjst.com/upfile/file/linonagadarapokudesulet.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ba68705a---tudokese.pdf
    • http://china-zub.ru/userfiles/file/rupedonakiji.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed969d5a684---3436920128.pdf
    • https://familienarbeit3plus.ch/userfiles/files/831222670.pdf
    • http://tamker.hu/userfiles/file/36376413012.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a228c16f502c6c2232dddcf2c5c6e082/demetedutimawo.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m0d6epltn2gjl7vbqipd6lrlqb/92101056060.pdf
    • http://ahcxdq.com/uploads/file/280406444044.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/207cb2242d52f2906f117dec88166246/8313013668.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5a3547e0---56442852974.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/lejuloj.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/60892178ee89ee57e19d1e2fac188eaa/gepow.pdf
    • http://sukhabalka.com/files/file/57462847782.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=championship+manager+18+apk+download
    • 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_off00011714.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 16792 bytes
font_01_sfnt_off00012f26.bin
bcd95a3819c38f59f1832ca2a17eeeeb8b16e44182160f5cd1abe20e249ab67d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 17888 bytes
font_02_sfnt_off00015e86.bin
32d493f860399bc35b82ca6848d215cf603f432a2779df2ed474a9c56dc35265
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E86 11212 bytes